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EP1021315B1 - Dispositif pour generer un signal declencheur de systeme de securite dans un vehicule lors d'un accident avec retournement - Google Patents

Dispositif pour generer un signal declencheur de systeme de securite dans un vehicule lors d'un accident avec retournement Download PDF

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Publication number
EP1021315B1
EP1021315B1 EP98936212A EP98936212A EP1021315B1 EP 1021315 B1 EP1021315 B1 EP 1021315B1 EP 98936212 A EP98936212 A EP 98936212A EP 98936212 A EP98936212 A EP 98936212A EP 1021315 B1 EP1021315 B1 EP 1021315B1
Authority
EP
European Patent Office
Prior art keywords
vehicle
acceleration
threshold
decision
safety device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98936212A
Other languages
German (de)
English (en)
Other versions
EP1021315A1 (fr
Inventor
Bernhard Mattes
Volker Breunig
Michael Henne
Lothar Groesch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1021315A1 publication Critical patent/EP1021315A1/fr
Application granted granted Critical
Publication of EP1021315B1 publication Critical patent/EP1021315B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0132—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R2021/0002—Type of accident
    • B60R2021/0018—Roll-over
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R2021/01306—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over monitoring vehicle inclination
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0132—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value
    • B60R2021/01322—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value comprising variable thresholds, e.g. depending from other collision parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0132—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value
    • B60R2021/01325—Vertical acceleration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0132—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value
    • B60R2021/01327—Angular velocity or angular acceleration

Definitions

  • the present invention relates to an arrangement for Generate a trigger signal for a Safety device in a vehicle at a Rollover process, the first means being provided the rate of rotation measured around the longitudinal axis of the vehicle first decision criterion for triggering a Derive safety device in the vehicle, and where second means are provided which are independent of the first Averaging in the direction of the transverse axis of the vehicle measured acceleration a second decision criterion derive for triggering the safety device.
  • all occupant protection devices installed in the vehicle in good time include for example roll bar, belt tensioner, front and Side airbags etc. So that all these protective devices can be triggered in time must be as early as possible can be recognized whether the vehicle turns around its Longitudinal axis, its transverse axis or vertical axis to one Rollover. Usually come Rollover operations around the longitudinal axis of the vehicle, Rotations of the vehicle about its vertical axis and its Transverse axes are rare. The Safety devices in the vehicle should only then be triggered when there is actually a rollover of the vehicle is coming.
  • EP 0 430 813 A1 describes an introductory statement Arrangement for generating a trigger signal for a Safety device during a rollover Vehicle.
  • To capture various Rollover processes of a vehicle become the output signals of a rotation rate sensor and three acceleration sensors evaluated.
  • Sensor signals provided. Which result from the different Trigger signals resulting in sensor signal evaluations fed here to an OR gate, which gives an ignition command an ignition device for roll bars or others Security devices forwards if one of the possible trigger signals are present at its inputs.
  • the second Threshold decision another acceleration threshold is the basis for the first threshold decision.
  • the Parallel branch decides as soon as the other Acceleration threshold for a certain period of time has been exceeded on triggering the Safety device, and the circuit gives it Trigger signal only when in both circuit branches at the same time it was decided to trigger.
  • FIG. 1 there is a first signal branch rotation rate signals ⁇ x, ⁇ y and ⁇ z, the of rotation rate sensors around the longitudinal axis x, the transverse axis y and the vertical axis z of a vehicle has been measured.
  • the rotation rate signals ⁇ x, ⁇ y and ⁇ z become a switching block 1 supplied with an integrator, the inclination angle from the rotation rates of the vehicle in relation to its axles.
  • the angles of inclination will be used in more detail below computing unit described in switching block 1 a first decision criterion e1 for triggering a safety device 2, e.g. from one or more airbags and Belt tensioners can exist.
  • the output signals supplied by the yaw rate sensors usually contain an offset of different sizes such as. depends on the temperature and aging. Because of this Offsets would result in a permanent integration of the rotation rate signals lead to inclination angles that are not caused by vehicle turns but come from the offset.
  • a start signal st is supplied to the integrator in switching block 1, which indicates the rotation rate at which integration started shall be.
  • the start signal st is from a Switching block 3 formed, the rotation rates ⁇ x, ⁇ y and ⁇ z compares to a threshold after filtering. exceeds the amount of the rotation rates determined empirically Threshold, the start signal st is output to the integrator 1. This influences interference on the rotation rate measurement, such as. the mentioned offset or braking and acceleration maneuvers, excluded from integration.
  • a vehicle FZ is shown schematically in FIG. 2, that over a horizontal plane FE, preferably the Road level, is in a tilted position.
  • rotation rate sensors DSx, DSy and DSz which measure the angular velocities ⁇ x, ⁇ y and ⁇ z about the longitudinal axis x, the Measure the transverse axis y and the vertical axis z of the tilted vehicle.
  • the center of this coordinate system is a fictional one selected vehicle fixed point S, preferably the vehicle center of gravity. According to the flow chart shown in Figure 4 the measurement of the angular velocities ⁇ x, ⁇ y and ⁇ z carried out in method step 20.
  • the cardan angle ⁇ z is not required because turning around the vertical axis of the vehicle is practically irrelevant for rolling over.
  • a surface fixed to the vehicle is specified for the further calculations.
  • This surface fixed to the vehicle is spanned between the points A1, A2, A3 and A4 in FIG. 2, these points being for example the wheel contact points of the vehicle.
  • the coordinates of the points A1, A2, A3 and A4 with respect to the vehicle's own coordinate system (x, y, z) can be described by vectors which originate from a point D lying in the surface fixed to the vehicle. The vector is an example in FIG a 2 from point D to corner point A2.
  • both the vehicle-fixed surface and the vehicle-fixed point S are projected into a horizontal plane.
  • the projection point Sp belonging to the vehicle-fixed point S also lies in the same horizontal plane.
  • the point D projected onto the horizontal plane forms the origin of a coordinate system with the axes x ', y' and z ', the z' axis lying in the projection direction.
  • a ip and s p can be decided in method step 25 whether the point Sp lies within or outside the area spanned between the points A1p, A2p, A3p and A4p. If the point Sp is outside of this area, the vehicle will surely roll over. A rollover is accordingly signaled in a method step 26, that is to say the first decision criterion e1 is issued for triggering the safety device 2.
  • a potential energy ⁇ U is calculated, which is required to bring the vehicle from its current position into an unstable position from which the vehicle overturns.
  • the point S fixed to the vehicle would have to increase its distance from the horizontal plane FE by an amount ⁇ h from the current position shown. Then the point fixed to the vehicle would have reached its maximum distance from the horizontal plane FE. If the vehicle were to rotate so far that the point fixed to the vehicle reached this maximum distance from the horizontal plane FE, the vehicle would inevitably roll over.
  • the ⁇ is the moment of inertia of the vehicle, and ⁇ is one measured with the rotation rate sensors Angular velocity around a vehicle axis.
  • ⁇ W is greater than the potential energy ⁇ U. If this is the case, it will surely roll over the vehicle come. A rollover is signaled accordingly, which fulfills the decision criterion e1.
  • a second signal path which processes the accelerations ax, ay and az in the direction of its longitudinal axis x, its transverse axis y and its vertical axis z to form a second decision criterion e2.
  • This signal path contains an arithmetic unit 5 and a threshold value decider 6.
  • a threshold value decider 8 is provided, the when the amount of measured acceleration az in the direction of the vertical axis z e.g. 0.2 times the value of Gravitational acceleration falls below for triggering the safety device 2 decides.
  • the output signals of the two threshold value deciders 6 and 8 are located at the inputs of an OR gate 9, the second at its output Makes decision criterion e2 if either in Switch block 6 or in switch block 8 or in both simultaneously the respective threshold has been reached.
  • FIG. 1 shows, a separate circuit is provided which has a trigger signal as2 generated.
  • the circuit contains two threshold value deciders 10 and 11, which are linked together by an AND gate 12 are.
  • the threshold value decider 10 receives as an input signal a measured around the longitudinal axis x of the vehicle Rotation rate ⁇ x.
  • the second threshold value decider 11 receives the measurement signal ay a high accelerations (greater than 10g) of the vehicle in the direction of its transverse axis y Acceleration sensor. Both exceed the rotation rate ⁇ x as well as the acceleration ay each a predetermined one empirically determined threshold, it can be assumed that the side impact of the vehicle against a low obstacle leads to such a strongly accelerated tilting movement that the safety device is triggered to protect the occupants must become. Accordingly, the output of the AND gate 12 a trigger signal ready.
  • the threshold signal 13 in the parallel branch becomes the measurement signal ay 'a lower accelerations (up to 3g) of the Vehicle in the direction of its transverse axis y measuring acceleration sensor fed. Exceeds this lower acceleration ay 'a predetermined, empirically determined Threshold and lies the measured acceleration ay 'for one empirically determined minimum duration above the threshold, this is the second criterion for triggering the safety device Fulfills.
  • the second threshold decision maker 14 checks whether the measured acceleration ay 'is its predetermined one Threshold exceeds for the minimum period. So if the criteria determined in both signal branches for triggering the safety device 2 at the same time are satisfied, it can be assumed that the trigger signal as2 is based on error-free sensing.
  • the two trigger signals as1 and as2 become one OR gate 16 supplied. If one of the two trigger signals as1 or as2 on the OR gate 16 receives the Safety device 2 the actual trigger signal as.
  • a sensor system described above exclusively for the detection of a side impact to provide a low obstacle.
  • ay and ay ' is the lateral occupant movement to consider.
  • the safety device must do so be triggered in time that z.
  • a belt tensioner still has an effect; i.e. the occupant may not be out yet slipped out of the belt. Generally, the occupant may have not yet moved too far sideways.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Air Bags (AREA)

Claims (2)

  1. Dispositif pour créer un signal de déclenchement pour une installation de sécurité équipant un véhicule en cas de retournement, comprenant:
    des premiers moyens (1) qui forment un premier critère de décision (e1) à partir de la vitesse de rotation ωx mesurée autour de l'axe longitudinal x du véhicule (FZ) à pour déclencher l'installation de sécurité (2) dans le véhicule (FZ) et
    des seconds moyens (5, 6) qui indépendamment des premiers moyens (2), forment à partir d'au moins une accélération (ay) mesurée dans la direction de l'axe transversal (ay) du véhicule (FZ), un second critère de décision (e2),
    caractérisé en ce que
    un premier circuit (7), émet un premier signal de déclenchement (as1) pour installation de sécurité (2), si les deux critères de décision (e1,e2) sont remplis simultanément
    et un second circuit (10, 11, 12) générant une second signal de déclenchement (as2) si en même temps la vitesse de rotation (ωx) autour de l'axe longitudinal (x) et l'accélération (ay) du véhicule dans la direction de l'axe transversal (y) dépassent chacun un seuil, le seuil de la vitesse de rotation (ωx) et le seuil de l'accélération (ay) étant choisis pour qu'en cas de choc latéral du véhicule sur un obstacle bas comme, par exemple, une bordure de trottoir, le système génère un signal de déclenchement (as2).
  2. Dispositif selon la revendication (1),
    caractérisé en ce que
    le circuit comporte en parallèle aux décisions à un seuil (10, 11) de la vitesse de rotation (ωx) autour de l'axe longitudinal (x) et de l'accélération (ay) de la direction de l'axe transversal (y), une seconde décision à seuil (13) concernant l'accélération (ay') dans la direction de l'axe transversal (y),
    la seconde décision à seuil (13) supposant un seuil d'accélération plus faible que le premier seuil de décision (11), pour que la branche parallèle, dès que le seuil d'accélération bas a été déplacé pendant une durée donnée, décide le déclenchement de l'installation de sécurité (2) et que le circuit (10,11,12,13,14,15) ne fournisse qu'un signal de déclenchement (as2) si dans les deux branches du circuit il a été décidé en même temps de déclencher.
EP98936212A 1997-10-06 1998-06-18 Dispositif pour generer un signal declencheur de systeme de securite dans un vehicule lors d'un accident avec retournement Expired - Lifetime EP1021315B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19744083A DE19744083A1 (de) 1997-10-06 1997-10-06 Anordnung zum Erzeugen eines Auslösesignals für eine Sicherheitseinrichtung in einem Fahrzeug bei einem Überrollvorgang
DE19744083 1997-10-06
PCT/DE1998/001669 WO1999017962A1 (fr) 1997-10-06 1998-06-18 Dispositif pour generer un signal declencheur de systeme de securite dans un vehicule lors d'un accident avec retournement

Publications (2)

Publication Number Publication Date
EP1021315A1 EP1021315A1 (fr) 2000-07-26
EP1021315B1 true EP1021315B1 (fr) 2003-05-21

Family

ID=7844723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98936212A Expired - Lifetime EP1021315B1 (fr) 1997-10-06 1998-06-18 Dispositif pour generer un signal declencheur de systeme de securite dans un vehicule lors d'un accident avec retournement

Country Status (6)

Country Link
US (1) US6424897B1 (fr)
EP (1) EP1021315B1 (fr)
JP (1) JP4112805B2 (fr)
AU (1) AU738106B2 (fr)
DE (2) DE19744083A1 (fr)
WO (1) WO1999017962A1 (fr)

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WO1999017962A1 (fr) 1999-04-15
US6424897B1 (en) 2002-07-23
JP4112805B2 (ja) 2008-07-02
DE19744083A1 (de) 1999-04-08
AU8533098A (en) 1999-04-27
DE59808489D1 (de) 2003-06-26
AU738106B2 (en) 2001-09-06
EP1021315A1 (fr) 2000-07-26

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